Removal of visual feedback lowers structural variability of inter-digit force coordination during sustained precision pinch.
Removal of visual feedback lowers structural variability of inter-digit force coordination during sustained precision pinch.
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DOI：
10.1016/j.neulet.2013.04.011
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发表时间：
2013-06-17
影响因子：
2.5
通讯作者：
Li ZM
中科院分区：
文献类型：
--
作者：
Li K;Marquardt TL;Li ZM
本研究考察了视觉反馈对精确捏手指间力协调的影响。16名健康的右撇子受试者被要求在稳定的力输出下捏一个仪器1分钟。前30秒提供视觉反馈，后30秒撤回视觉反馈。采用去趋势波动分析（DFA）和去趋势互相关分析（DCCA）方法量化每个手指的力和手指之间的力相关性的时间依赖结构。去除视觉反馈后，拇指的DFA标度指数αDFA从1.10±0.12增加到1.29±0.13，食指的αDFA从0.95±0.08增加到1.33±0.13 (F1,95=372.47, p<0.001)；DCCA标度指数αDCCA由1.00±0.08上升至1.33±0.13 （t95=20.33, p<0.001）。在去除视觉反馈后的第一个5秒开始观察到结构变化。结果表明，去除视觉反馈降低了指间力协调的结构变异性。这种变化反映在高级控制策略中，导致在没有视觉输入的体感反馈下，两个手指的耦合更加紧密。
This study examined the effects of visual feedback on inter-digit force coordination during precision pinch. Sixteen healthy, right-handed subjects were instructed to pinch an instrumented apparatus for 1 min with a stable force output. Visual feedback was provided for the first 30 s and withdrawn for the second 30 s. Detrended fluctuation analysis (DFA) and detrended cross-correlation analysis (DCCA) methods were used to quantify the time-dependent structures of each digit’s force and of the force correlation between the digits. After removing visual feedback, the DFA scaling exponent, αDFA, increased from 1.10±0.12 to 1.29±0.13 for the thumb and from 0.95±0.08 to 1.33±0.13 for the index finger (F1,95=372.47, p<0.001); the DCCA scaling exponent, αDCCA, increased from 1.00±0.08 to 1.33±0.13 (t95=20.33, p<0.001). Structural changes were observed beginning with the first 5 s epoch after the removal of visual feedback. The results provide evidence that removing visual feedback lowers the structural variability of inter-digit force coordination. This change is reflected in the high-level control strategy, resulting in the two digits being more tightly coupled under somatosensory feedback without visual inputs.
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影响因子：
2.4
作者：
Li, ZM
通讯作者：
Li, ZM
DOI：
10.1016/j.physa.2010.12.038
发表时间：
2011-05-01
影响因子：
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作者：
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通讯作者：
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影响因子：
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作者：
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DOI：
10.3758/bf03206496
发表时间：
2005-02-01
期刊：
PERCEPTION & PSYCHOPHYSICS
影响因子：
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作者：
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通讯作者：
Newell, KM
影响因子：
2.5
作者：
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通讯作者：
Riley, Michael A.